﻿using System;
using System.Configuration;
using System.Linq;
using System.Text;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Xml.Linq;
using DotNetOpenAuth.ApplicationBlock;
using DotNetOpenAuth.OAuth;

/// <summary>
/// A page to demonstrate downloading a Gmail address book using OAuth.
/// </summary>
public partial class GoogleAddressBook : System.Web.UI.Page {
	private string AccessToken {
		get { return (string)Session["GoogleAccessToken"]; }
		set { Session["GoogleAccessToken"] = value; }
	}

	private InMemoryTokenManager TokenManager {
		get {
			var tokenManager = (InMemoryTokenManager)Application["GoogleTokenManager"];
			if (tokenManager == null) {
				string consumerKey = ConfigurationManager.AppSettings["googleConsumerKey"];
				string consumerSecret = ConfigurationManager.AppSettings["googleConsumerSecret"];
				if (!string.IsNullOrEmpty(consumerKey)) {
					tokenManager = new InMemoryTokenManager(consumerKey, consumerSecret);
					Application["GoogleTokenManager"] = tokenManager;
				}
			}

			return tokenManager;
		}
	}

	protected void Page_Load(object sender, EventArgs e) {
		if (this.TokenManager != null) {
			MultiView1.ActiveViewIndex = 1;

			if (!IsPostBack) {
				var google = new WebConsumer(GoogleConsumer.ServiceDescription, this.TokenManager);

				// Is Google calling back with authorization?
				var accessTokenResponse = google.ProcessUserAuthorization();
				if (accessTokenResponse != null) {
					this.AccessToken = accessTokenResponse.AccessToken;
				} else if (this.AccessToken == null) {
					// If we don't yet have access, immediately request it.
					GoogleConsumer.RequestAuthorization(google, GoogleConsumer.Applications.Contacts);
				}
			}
		}
	}

	protected void getAddressBookButton_Click(object sender, EventArgs e) {
		var google = new WebConsumer(GoogleConsumer.ServiceDescription, this.TokenManager);

		XDocument contactsDocument = GoogleConsumer.GetContacts(google, this.AccessToken);
		var contacts = from entry in contactsDocument.Root.Elements(XName.Get("entry", "http://www.w3.org/2005/Atom"))
		               select new { Name = entry.Element(XName.Get("title", "http://www.w3.org/2005/Atom")).Value, Email = entry.Element(XName.Get("email", "http://schemas.google.com/g/2005")).Attribute("address").Value };
		StringBuilder tableBuilder = new StringBuilder();
		tableBuilder.Append("<table><tr><td>Name</td><td>Email</td></tr>");
		foreach (var contact in contacts) {
			tableBuilder.AppendFormat(
				"<tr><td>{0}</td><td>{1}</td></tr>",
				HttpUtility.HtmlEncode(contact.Name),
				HttpUtility.HtmlEncode(contact.Email));
		}
		tableBuilder.Append("</table>");
		resultsPlaceholder.Controls.Add(new Literal { Text = tableBuilder.ToString() });
	}
}
